Ownership: Check the catalogs in your library.
    AUTHOR:
 MONO AUTH: Fetner, Robert Hudson
MONO TITLE: A geophysical survey using gravity methods to delineate the
            bedrock surface in Madison County, Ohio
 CORP INFO: Wright State University; Dayton, OH; United States
            Master's
    SOURCE: 124
REFERENCES: 30
      YEAR: 1994
  LANGUAGE: English
  PUB TYPE: Thesis, Monographic
    FORMAT: illus., 4 tables
  ABSTRACT: An abundant source of water is important for farming, industry,
            and domestic needs. In Madison County, Ohio very little water is
            present in the bedrock, and wells drilled into glacial till
            frequently do not yield enough water for an extended period of
            time. Buried river valleys are often the site of good water
            producing aquifers. Locating such buried valleys could increase
            the ground water supply for the surrounding communities. Bedrock
            valleys could be located by using well log information,
            unfortunately, existing wells are not evenly distributed and
            additional wells are expensive to drill. Seismic refraction is
            the most precise geophysical method, but it is expensive and
            time consuming. Electrical resistivity methods can also be used,
            but results are often ambiguous. The gravity method is, however,
            specially well suited for large area surveys because it is
            inexpensive and fast. Gravity data were collected creating a
            Bouguer Anomaly surface for the area. An approximation of a
            buried valley location was made by delineating the negative
            residual anomalies by subtracting a fourth order polynomial
            approximation from the Bouguer surface. Results from the gravity
            survey showed that the Teays River Valley did not take the same
            course as previously believed. The buried valleys mapped in this
            study correlate well with those found using gravity in adjacent
            counties. The Teays Valley has been found to enter from the
            southeast corner of Madison County and exit the county north of
            the town of South Solon. A tributary to the Teays River, or
            possibly an earlier (or even contemporary) flow of the same
            river, was also found further north in the county. The glacial
            deposits covering the valley usually have high porosity and
            permeability and, therefore, are considered to be a good source
            of groundwater. Locating wells in these valleys will benefit
            urban and farming areas and possibly promote industrial
            development.
DESCRIPTOR: bedrock; Bouguer anomalies; buried valleys; exploration;
            geophysical surveys; gravity anomalies; gravity surveys; ground
            water; Madison County Ohio; Ohio; paleohydrology; surveys; Teays
            River valley; United States; water resources; water supply
 LATITUDES: N394000; N401000
LONGITUDES: W0831500; W0834000